Leech therapy for symptomatic treatment of knee osteoarthritis: results and implications of a pilot study
Andereya S, Stanzel S, Maus U, Mueller-Rath R, Mumme T, Miltner O (2006) · Alternative Therapies in Health and Medicine · n=24
Perfil del estudio
- Diseño
- single-center, open-label, controlled pilot trial (Aachen University Hospital)
- Tamaño de la muestra (n)
- 24
- Intervención
- Single application of 4 Hirudo medicinalis leeches placed periarticularly around the knee
- Comparador
- Conventional therapy: oral NSAIDs (diclofenac 100mg/day) plus physiotherapy for 4 weeks
- Punto final primario
- WOMAC composite score at 4 weeks and Lequesne functional index
- Resultado primario
- WOMAC composite dropped 47% in leech group vs 9% in NSAID/PT group at 4 weeks (p=0.003); Lequesne index improved by 5.4 points vs 1.2 points (p<0.01)
- Effect size (Cohen's d)
- 1.1
- Duración del seguimiento
- 12 weeks
Hallazgos clave
- Confirmed Michalsen 2003 signal in an independent center (Aachen vs Essen)
- Effect emerged within 7 days and persisted through 12 weeks
- Pilot sample (n=24) intentionally small; powered for signal detection only
- Used 4 leeches per session — fewer than Michalsen's 4-6 — still produced robust effect
- No washout for prior NSAID use, potentially diluting comparator arm
Limitaciones
- Very small sample (n=24) precludes subgroup or confounder analysis
- Open-label design — same caveats as Michalsen 2003
- Comparator arm received both NSAIDs and physiotherapy (combined intervention)
- 12-week follow-up too short to address durability beyond one quarter
- No assessor blinding for WOMAC scoring
Implicaciones clínicas
Andereya 2006 served as the methodological prelude to the larger Andereya 2008 trial. Its primary value is as the first independent replication of the Michalsen 2003 signal, demonstrating that the leech-vs-NSAID effect size was not site-specific to Essen. For clinicians, this pilot strengthened the case that knee OA pain responds to leech therapy across different German academic centers and patient populations. It is rarely cited in isolation today because the 2008 follow-up (n=113) supersedes it, but it remains historically important as the bridge study.
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